WPF 实现 RichTextBox 关键字查询高亮

一、环境说明
二、代码
三、演示结果
四、参考资料

导言：我想实现一个简单的载入RTF文件到RichTextBox 中并可以查找关键字，并高亮关键字，提供上一个关键字与下一个关键字之间相互切换的效果，目前还有些小问题，就是RichTextBox 窗口导航到关键字的位置有些问题。

建议先看 演示结果 再看看是不是你需要的

一、环境说明

系统：Windows 10.0.19044 家庭版
工具：Visual Stdio 2019 community
.Net：.Net FrameWork 4.6.2
类型：WPF桌面应用

二、代码

1、前端代码

<Window x:Class="xx_MSS.Pages.IntroductionWindow"xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"xmlns:d="http://schemas.microsoft.com/expression/blend/2008"xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"xmlns:local="clr-namespace:xx_MSS.Pages"mc:Ignorable="d"  FontSize="18"Title="测试测试" Height="680" Width="1028"><Grid><Grid.RowDefinitions><RowDefinition Height="60"/><RowDefinition/></Grid.RowDefinitions><Grid Grid.Row="0"><Grid.ColumnDefinitions><ColumnDefinition/><ColumnDefinition/><ColumnDefinition Width="40"/></Grid.ColumnDefinitions><StackPanel Orientation="Horizontal" Grid.Column="0"><Label Content="质谱仪：" FontWeight="Bold" VerticalAlignment="Top" Margin="40, 10, 0,0" /><ComboBox Grid.Row="2" x:Name="m_combox" Width="150" Height="30" VerticalAlignment="Top" Margin="0, 10" SelectionChanged="upDateDoucument"><ComboBoxItem Content="质谱仪器1" IsSelected="True"/><ComboBoxItem Content="质谱仪器2"/></ComboBox></StackPanel><StackPanel Orientation="Horizontal"  Grid.Column="1"><Label Content="搜索："  FontWeight="Bold"  VerticalAlignment="Top" Margin="10, 10, 0,0" /><TextBox x:Name="m_SearchTextBox" Width="300" Height="30" VerticalAlignment="Top"  Margin="0, 10" KeyUp="excetueSearch"/><Button x:Name="m_SearchBefore" Click="searchAfterBeforeBtnClicked" Height="30"  Content="《"  Width="40" Margin="0,10,0,20"/><Button x:Name="m_SearchAfter" Click="searchAfterBeforeBtnClicked" Height="30"  Margin="0,10,0,20" Content="》"  Width="40"/></StackPanel></Grid><RichTextBox x:Name="m_richText" Grid.Row="1" BorderThickness="0" Margin="60, 10, 60, 5" /></Grid>
</Window>

2、后端代码

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Shapes;
using System.Diagnostics;namespace xx_MSS.Pages
{public class CommonColorsHelp{public static Color KeyFontColor = Color.FromRgb(0, 0, 0);public static Color DefaultFontColor = Color.FromRgb(0, 0, 0);public static Color SelectedKeyBackGroundColor = Color.FromRgb(234, 167, 255);public static Color SelectedKeyFontColor = Color.FromRgb(0, 0, 0);public static Color DefaultBackGroundColor = Color.FromRgb(255, 255, 255);}/// <summary>/// Introduction.xaml 的交互逻辑/// </summary>public partial class IntroductionWindow : Window{private Dictionary<string, string> m_mapBooksPairs;public IntroductionWindow(){InitializeComponent();m_richText.IsReadOnly = true;//绑定页面而已，在根路径下放置几个rtf文件即可m_mapBooksPairs = new Dictionary<string, string>();m_mapBooksPairs.Add("质谱仪器1", "./Documents/one.rtf");m_mapBooksPairs.Add("质谱仪器2", "./Documents/two.rtf");loadFile(m_combox.Text, m_richText);}/// <summary>///     加载文件/// </summary>/// <param name="filename"></param>/// <param name="richTextBox"></param>private  void loadFile(string filename, RichTextBox richTextBox){filename = m_mapBooksPairs[filename];if (string.IsNullOrEmpty(filename)){throw new ArgumentNullException();}if (!File.Exists(filename)){throw new FileNotFoundException();}using (FileStream stream = File.OpenRead(filename)){TextRange documentTextRange = new TextRange(richTextBox.Document.ContentStart, richTextBox.Document.ContentEnd);string dataFormat = DataFormats.Text;string ext = System.IO.Path.GetExtension(filename);if (String.Compare(ext, ".xaml", true) == 0){dataFormat = DataFormats.Xaml;}else if (String.Compare(ext, ".rtf", true) == 0){dataFormat = DataFormats.Rtf;}documentTextRange.Load(stream, dataFormat);}}private void upDateDoucument(object sender, SelectionChangedEventArgs e){ComboBox comboBox = (ComboBox)sender;var name = comboBox.SelectedItem.ToString().Split(':')[1].Trim();if(m_mapBooksPairs != null){loadFile(name, m_richText);}}private void excetueSearch(object sender, KeyEventArgs e){if(e.Key == Key.Enter){               string searchKey = m_SearchTextBox.Text.Trim();if (searchKey != ""){ChangeSeachKeyWordsColor(searchKey);}else{ReSetBackGroundAll();}}}/// <summary>/// 改变在文章中用户搜索的关键字的字体颜色/// </summary>/// <param name="keyword"></param>public void ChangeSeachKeyWordsColor(string keyword){ChangeColorWithResout(keyword);}/// <summary>/// 改变关键字的字体颜色/// </summary>/// <param name="keyword">用户搜索关键字</param>/// <returns></returns>private List<TextRange> ChangeColorWithResout(string keyword){if (!string.IsNullOrEmpty(m_ProSearchkey)){ChangeColor(CommonColorsHelp.DefaultFontColor, m_ProSearchkey);ReSetBackGroundAll();}m_ProSearchkey = keyword;return ChangeColor(CommonColorsHelp.KeyFontColor, keyword);}/// <summary>/// 设置背景色/// </summary>/// <param name="l"></param>/// <param name="textRange"></param>public void SetBackGround(Color l, TextRange textRange){textRange.ApplyPropertyValue(TextElement.BackgroundProperty, new SolidColorBrush(l));textRange.ApplyPropertyValue(TextElement.ForegroundProperty, new SolidColorBrush(CommonColorsHelp.SelectedKeyFontColor));}/// <summary>/// 重新设置背景色/// </summary>/// <param name="textRange">关键字的的TextRange</param>/// <param name="isCurrKeyWord">是否是当前的关键字</param>public void ReSetBackGround(TextRange textRange, bool isCurrKeyWord){textRange.ApplyPropertyValue(TextElement.BackgroundProperty, new SolidColorBrush(CommonColorsHelp.DefaultBackGroundColor));if (isCurrKeyWord){textRange.ApplyPropertyValue(TextElement.ForegroundProperty, new SolidColorBrush(CommonColorsHelp.KeyFontColor));}else{textRange.ApplyPropertyValue(TextElement.ForegroundProperty, new SolidColorBrush(CommonColorsHelp.DefaultFontColor));}}/// <summary>/// 上一处/// </summary>public void SetUpBackGround(){if (m_TextList != null && m_TextList.Count > 0){//Rect r = m_TextList[currNumber].Start.GetCharacterRect(LogicalDirection.Backward);//m_richText.ScrollToVerticalOffset(r.Y);//FrameworkContentElement e = m_TextList[currNumber].Start.Parent as FrameworkContentElement;//if (e != null)//    e.BringIntoView();///滚动到指定位置var characterRect = m_TextList[currNumber].Start.GetCharacterRect(LogicalDirection.Forward);m_richText.ScrollToVerticalOffset(m_richText.VerticalOffset + characterRect.Top - m_richText.ActualHeight / 2d);ReSetBackGround(m_TextList[currNumber], true);currNumber--;if (currNumber < 0){currNumber = m_TextList.Count - 1;}SetBackGround(CommonColorsHelp.SelectedKeyBackGroundColor, m_TextList[currNumber]);}}/// <summary>/// 下一处/// </summary>public void SetDownBackGround(){if (m_TextList != null && m_TextList.Count > 0){//Rect r = m_TextList[currNumber].Start.GetCharacterRect(LogicalDirection.Backward);//m_richText.ScrollToVerticalOffset(r.Y);//FrameworkContentElement e = m_TextList[currNumber].Start.Parent as FrameworkContentElement;//if (e != null)//    e.BringIntoView();var characterRect = m_TextList[currNumber].Start.GetCharacterRect(LogicalDirection.Forward);m_richText.ScrollToVerticalOffset(m_richText.VerticalOffset + characterRect.Top - m_richText.ActualHeight / 2d);ReSetBackGround(m_TextList[currNumber], true);currNumber++;if (currNumber >= m_TextList.Count){currNumber = 0;}SetBackGround(CommonColorsHelp.SelectedKeyBackGroundColor, m_TextList[currNumber]);}}/// <summary>/// 改变关键字的具体实现/// </summary>/// <param name="l"></param>/// <param name="richTextBox1"></param>/// <param name="selectLength"></param>/// <param name="tpStart"></param>/// <param name="tpEnd"></param>/// <returns></returns>private TextPointer selecta(Color l, RichTextBox richTextBox1, int selectLength, TextPointer tpStart, TextPointer tpEnd){TextRange range = richTextBox1.Selection;range.Select(tpStart, tpEnd);//高亮选择range.ApplyPropertyValue(TextElement.ForegroundProperty, new SolidColorBrush(l));return tpEnd.GetNextContextPosition(LogicalDirection.Forward);}/// <summary>/// 把所有背景恢复到默认/// </summary>private void ReSetBackGroundAll(){if (m_TextList != null){foreach (TextRange textRange in m_TextList){ReSetBackGround(textRange, false);}}}/// <summary>/// 当前第几处关键字被选中/// </summary>private int currNumber = 0;/// <summary>/// 改变关键字字体颜色/// </summary>/// <param name="l">颜色</param>/// <param name="keyword">关键字</param>/// <returns></returns>private List<TextRange> ChangeColor(Color l, string keyword){m_TextList = new List<TextRange>();//设置文字指针为Document初始位置           //richBox.Document.FlowDirection           TextPointer position = m_richText.Document.ContentStart;while (position != null){//向前搜索,需要内容为Text       if (position.GetPointerContext(LogicalDirection.Forward) == TextPointerContext.Text){//拿出Run的Text        string text = position.GetTextInRun(LogicalDirection.Forward);//可能包含多个keyword,做遍历查找           int index = 0;index = text.IndexOf(keyword, 0);if (index != -1){TextPointer start = position.GetPositionAtOffset(index);TextPointer end = start.GetPositionAtOffset(keyword.Length);m_TextList.Add(new TextRange(start, end));position = selecta(l, m_richText, keyword.Length, start, end);}}//文字指针向前偏移   position = position.GetNextContextPosition(LogicalDirection.Forward);}if (m_TextList != null && m_TextList.Count > 0){//重置currNumber = 0;SetBackGround(CommonColorsHelp.SelectedKeyBackGroundColor, m_TextList[currNumber]);}return m_TextList;}/// <summary>/// 当前关键字共搜索出的结果集合/// </summary>private List<TextRange> m_TextList;private string m_ProSearchkey;private void searchAfterBeforeBtnClicked(object sender, RoutedEventArgs e){Button button = (Button)sender;switch(button.Name){case "m_SearchBefore":SetUpBackGround();break;case "m_SearchAfter":SetDownBackGround();break;}}}
}

三、演示结果

四、参考资料

WPF搜索关键字：https://www.cnblogs.com/shanranlei/p/3635317.html
RichTextBox滚动到关键字位置：https://stackoverflow.com/questions/6908983/wpf-richtextbox-scroll-to-textpointer

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WPF 实现 RichTextBox 关键字查询高亮

WPF 实现 RichTextBox 关键字查询高亮

一、环境说明

二、代码

三、演示结果

四、参考资料

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